linux-kernel - Re: [PATCH net-next v3] net: stmmac: dwmac-qcom-ethqos: Enable TBS on all queues but 0

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Message-ID: <182afe94-e6db-4329-8653-93f6315dea54@quicinc.com>
Date: Wed, 7 Feb 2024 15:54:52 -0800
From: Jeff Johnson <quic_jjohnson@...cinc.com>
To: Abhishek Chauhan <quic_abchauha@...cinc.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S.
 Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        "Jakub
 Kicinski" <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin
	<mcoquelin.stm32@...il.com>, <netdev@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Andrew Halaney <ahalaney@...hat.com>
CC: <kernel@...cinc.com>
Subject: Re: [PATCH net-next v3] net: stmmac: dwmac-qcom-ethqos: Enable TBS on
 all queues but 0

On 2/7/2024 2:40 PM, Abhishek Chauhan wrote:
> TSO and TBS cannot co-exist. TBS requires special descriptor to be
> allocated at bootup. Initialising Tx queues at probe to support
> TSO and TBS can help in allocating those resources at bootup.
> 
> TX queues with TBS can support etf qdisc hw offload.
> 
> This is similar to the patch raised by NXP
> commit 3b12ec8f618e ("net: stmmac: dwmac-imx: set TSO/TBS TX queues default 
> settings")
> 
> Changes since v2:
> - Fixed the styling of comment in the dwmac-qcom-ethqos.c
> - Followed the upstream format to give other glue
>   driver references to solve the same problem
> - Appended  the subject with net-next
> - Discussion of why this patch is required is discussed in
> https://lore.kernel.org/netdev/c2497eef-1041-4cd0-8220-42622c8902f4@quicinc.com/
> 
> Changes since v1:
> - Subject is changed as per upstream guidelines
> - Added a reference of a similar change done by NXP in
>   body of the commit message

Note that your patch change history should not be part of your commit
text, but instead should be below the "---" line.
> 
> Signed-off-by: Abhishek Chauhan <quic_abchauha@...cinc.com>
> ---

in other words put it here. the change history will not be part of the
git history

I strongly suggest looking at b4 since it will manage your patch history:
https://b4.docs.kernel.org/en/latest/index.html#for-developers

>  drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> index 31631e3f89d0..2691a250a5a7 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> @@ -728,7 +728,7 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
>  	struct stmmac_resources stmmac_res;
>  	struct device *dev = &pdev->dev;
>  	struct qcom_ethqos *ethqos;
> -	int ret;
> +	int ret, i;
>  
>  	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
>  	if (ret)
> @@ -822,6 +822,10 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
>  		plat_dat->serdes_powerdown  = qcom_ethqos_serdes_powerdown;
>  	}
>  
> +	/* Enable TSO on queue0 and enable TBS on rest of the queues */
> +	for (i = 1; i < plat_dat->tx_queues_to_use; i++)
> +		plat_dat->tx_queues_cfg[i].tbs_en = 1;
> +
>  	return devm_stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res);
>  }
>